It does give more power if you have a engine with mods or that have a high compression piston.

Octane facts

 

The only gain you get from higher octane is when your engine isn't running right with lower octane. Like if I ran 87 in my warrior it runs like total crap because of the high compression piston. Put in 93 and it flies. But when it was stock a sensitive dyno couldn't tell the difference between regular and premium.

 

No, again octane rating of a fuel has absolutely nothing to do with power. The octane rating is a theoretical number assigned to fuel for its ability to resist ignition. If you have a high compression engine, which exrider12 does not, you have to run higher octane rated fuel to keep the fuel from prematurely igniting from the heat of the compression. Like Recon99 said he has to run 93 octane fuel because he is ported and running 10.25:1 compression on his warrior. Lower octane fuel will ignite to soon, from the heat of the compression, and result in less power because of the mistimed fuel explosion (instead of timed burn). So running higher than needed rated octane fuel is just a waste of money.

I was in the fuel marketing business for a some time and we loved selling that "premium" gasoline. 91 octane fuel only cost about 3-6 cents more wholesale than 87 octane fuel but the consumer price on the pumps is usually 14 to 20 cents more per gallon.

 

Yeah that must be nice ripping people off like that. Even if they lowered the gas prices .20 the oil companies would still make billions. And we could ride our quads more.

 

wtf? you guys run 93 octane with only 10.25:1 compression? ds250 has 10.6:1 compression stock, should i be running 93 octane too then? the manual says 87, but do you think i'll be faster on 93?

i run "bronze" fuel in my quad (i think that is 87) should i run "gold"?? (which is 91 i think) both are pump gas

 

It will not give you much more power and they are so much $$$

 

dude my quad drinks only about a quart of gas per hour!!! it'll only cost me an extra 5 cents per hour extra to run 93 octane...... and will i see power gains- however small they are- because those guys are running 93 with 10.25:1 compression and i am running 87 octane with 10.6:1 compression

 

Most likely if it actually has compression that high, and it's running good with 87, then bombardier de-tuned it through the design of the cam, with overlap and all that stuff, so that it will run on 87. It would be worth a shot to see if you notice a difference, but most likely you won't notice much or anything because of how they have that engine restricted and tuned.

 

well then im hoping to get a more aggressive cam if it ever comes out (i sure hope it does cuz i think the z250 and the 250ex have aftermarket cams out for themselves)

cant you also get an adjustable cdi that you can change the timing curves on to make seem like it has higher or lower compression?

 

There are programmable cdi's out there, but they're in the $400 range, and probably aren't available for your ds. What they do is change the spark timing, not really anything to do with the compression.